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https://issues.apache.org/jira/browse/THRIFT-5195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17099332#comment-17099332
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Jens Geyer commented on THRIFT-5195:
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I can't contribute much on the technical aspects but I want to emphasize that a
union *by definition* has "all optional fields", otherwise it would not be a
{{union}} but a {{struct}}. That's why the compiler complains when you try to
set union members to anything else than optional.
> Swift enums (generated from Thrift unions) don't work
> -----------------------------------------------------
>
> Key: THRIFT-5195
> URL: https://issues.apache.org/jira/browse/THRIFT-5195
> Project: Thrift
> Issue Type: Bug
> Components: Swift - Library
> Affects Versions: 0.14.0
> Reporter: Darius Jankauskas
> Priority: Major
>
> I have some service functions not working. The required argument it takes is
> a Swift enum with associated value. This was generated from a Thrift union
> with all optional fields. The problem is that the associated value never gets
> sent to the server, i.e. TStruct.write() never encounters the associated
> value. Deeper in the forEach() method the propName is found but returns null
> in
> {code:swift}
> if let tval = unwrap(any: propValue) as? TSerializable, let id =
> Self.fieldIds[propName] {{code}
> I've never used reflection (the Mirror class) nor contributed here but am
> willing to try.
> If anyone has any ideas/suggestions how to fix this, please let me know.
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